Polish apache/incubator-dubbo/#4096 : To add new module for Dubbo Event

[mercyblitz]

#4096

[codecov-io]

Codecov Report

Merging #4099 into cloud-native will increase coverage by 0.1%.
The diff coverage is 80.76%.

@@                Coverage Diff                @@
##             cloud-native    #4099     +/-   ##
=================================================
+ Coverage           62.71%   62.81%   +0.1%     
- Complexity            545      584     +39     
=================================================
  Files                 762      770      +8     
  Lines               32752    32882    +130     
  Branches             5162     5172     +10     
=================================================
+ Hits                20539    20656    +117     
- Misses               9856     9861      +5     
- Partials             2357     2365      +8

Impacted Files	Coverage Δ	Complexity Δ
...main/java/org/apache/dubbo/event/GenericEvent.java	100% <100%> (ø)	2 <2> (?)
...nt/src/main/java/org/apache/dubbo/event/Event.java	100% <100%> (ø)	2 <2> (?)
...rg/apache/dubbo/event/ParallelEventDispatcher.java	100% <100%> (ø)	1 <1> (?)
.../org/apache/dubbo/event/DirectEventDispatcher.java	100% <100%> (ø)	1 <1> (?)
...va/org/apache/dubbo/common/utils/ReflectUtils.java	68.05% <33.33%> (-1.44%)	0 <0> (ø)
...n/java/org/apache/dubbo/event/EventDispatcher.java	66.66% <66.66%> (ø)	2 <2> (?)
...c/main/java/org/apache/dubbo/event/Listenable.java	77.77% <77.77%> (ø)	5 <5> (?)
...ain/java/org/apache/dubbo/event/EventListener.java	86.95% <86.95%> (ø)	9 <9> (?)
...rg/apache/dubbo/event/AbstractEventDispatcher.java	94.44% <94.44%> (ø)	17 <17> (?)
...apache/dubbo/common/config/ConfigurationUtils.java	64% <0%> (-8%)	0% <0%> (ø)
... and 14 more

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[chickenlj]

LGTM.